#include "stdio_impl.h"

/* stdout.c will override this if linked */
static FILE *volatile dummy = 0;
weak_alias(dummy, __stdout_used);
weak_alias(dummy, __stderr_used);

int fflush(FILE *f)
{
#ifdef LOSCFG_KERNEL_CPPSUPPORT
    uint32_t p = (uintptr_t)f;
    extern char _sstack, _estack;
    static const int sstack = (const int)&_sstack;
    static const int estack = (const int)&_estack;
    if (p < sstack || p > estack) {
        f = stdout;
    }
#endif
    if (!f) {
        int r = 0;
        if (__stdout_used) {
            r |= fflush(__stdout_used);
        }
        if (__stderr_used) {
            r |= fflush(__stderr_used);
        }

        for (f = *__ofl_lock(); f; f = f->next) {
            FLOCK(f);
            if (f->wpos != f->wbase) {
                r |= fflush(f);
            }
            FUNLOCK(f);
        }
        __ofl_unlock();

        return r;
    }

    FLOCK(f);

    /* If writing, flush output */
    if (f->wpos != f->wbase) {
        f->write(f, 0, 0);
        if (!f->wpos) {
            FUNLOCK(f);
            return EOF;
        }
    }

#ifndef __LITEOS__
    /* If reading, sync position, per POSIX */
    if (f->rpos != f->rend)
        f->seek(f, f->rpos - f->rend, SEEK_CUR);
#else
    if (f->rpos != f->rend)
        f->seek64(f, f->rpos - f->rend, SEEK_CUR);
#endif

    /* Clear read and write modes */
    f->wpos = f->wbase = f->wend = 0;
    f->rpos = f->rend = 0;

    FUNLOCK(f);
    return 0;
}

weak_alias(fflush, fflush_unlocked);
